Structure/properties relationships in photoinitiators of polymerization: 10. The behaviour of bichromophoric derivatives

Abstract The photochemical behaviour and excited state processes of three new α -sulphonyl acetophenones exhibiting a high efficiency in the radical polymerization of acrylic coatings have been studied using time resolved laser spectroscopy and steady state photolysis techniques. The triplet state energy levels greatly depend on the substituent present on the compound. The influence of the environment viscosity on energy and electron transfers has been studied. A complete characterization of the excited states has been done. Effects of the bichromophoric structure compared to that of monochromophoric derivatives are discussed.

[1]  J. Fouassier,et al.  A laser spectroscopy investigation of excited-state processes in α-sulphonyl ketones , 1989 .

[2]  J. Fouassier,et al.  Radiation Curing in Polymer Science and Technology—Volume II , 1993 .

[3]  K. Dietliker.  Photoinitiators for Pigmented Systems , 1993 .

[4]  J. Fouassier,et al.  Radiation curing in polymer science and technology , 1993 .

[5]  J. Fouassier,et al.  Structure/properties relationships in photoinitiators of polymerization—9. The behaviour of a new bis α-sulphonyl ketone derivative , 1997 .

[6]  Tsunetoshi Kobayashi.  A new rule for photoelectron angular distributions of molecules , 1978 .

[7]  H. Timpe,et al.  Light-induced polymer and polymerization reactions XXXIII: direct photoinitiation of methyl methacrylate polymerization by excited states of ketones , 1989 .

[8]  Steven L. Murov,et al.  Handbook of photochemistry , 1973 .

[9]  J. Fouassier,et al.  Relations structure-proprietes dans les photoamorceurs de polymerisation—8. les derives de sulfonyl cetones , 1993 .

[10]  M. Okamoto,et al.  Study of the Fractional Power Dependence on Solvent Viscosity of the Rate Constant for Bimolecular Diffusion-Influenced Quenching Reactions between Oxygen and the Singlet and Triplet States of Anthracene Derivatives , 1994 .

[11]  R. Cooks,et al.  Energy partitioning data as an ion structure probe. Substituted anisoles , 1973 .

[12]  J. Fouassier,et al.  Time-resolved laser-pumped dye laser spectroscopy: energy and electron transfer in ketones , 1987 .

[13]  K. Sandros.  Transfer of triplet state energy in fluid solutions , 1964 .

[14]  R. S. Davidson,et al.  Some aspects of the role of amines in the photoinitiated polymerisation of acrylates in the presence and absence of oxygen , 1995 .